@Component
public class MybatisPlusObjectHandler implements MetaObjectHandler {

  @Override
  public void insertFill(MetaObject metaObject) {
    Date now = new Date();

    Object crteTime = getFieldValByName("crteTime", metaObject);
    if (Objects.isNull(crteTime)) {
      setFieldValByName("crteTime", now, metaObject);
    }

    Object optTime = getFieldValByName("optTime", metaObject);
    if (Objects.isNull(optTime)) {
      setFieldValByName("optTime", now, metaObject);
    }

    setFieldValByName("invdFlag", TpcConstant.INVD, metaObject);
  }

  @Override
  public void updateFill(MetaObject metaObject) {
    Object optTime = getFieldValByName("optTime", metaObject);
    if (Objects.isNull(optTime)) {
      setFieldValByName("optTime", new Date(), metaObject);
    }
  }
}

<bean class="xxx.xxx.xxx.MybatisPlusObjectHandler" id="myMetaObjectHandler"/>

  <bean id="globalConfiguration" class="com.baomidou.mybatisplus.core.config.GlobalConfig">
    <property name="metaObjectHandler" ref="myMetaObjectHandler"/>
  </bean>

  <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
    <!-- 注入公共字段填充處理器 -->
    <property name="globalConfig" ref="globalConfiguration" />
  </bean>